Yes, good old phone auto"correct" again! How do the different widths of h alpha filters behave under light pollution?

PeterW

I have used 12nm and 7nm H-alpha filters. Under severe light pollution, the 7nm cuts out more light pollution than the 12nm and gives slightly higher contrast when using faster optics - faster than f2. When I use my telescopes (f > f7), I prefer the 12nm filter.
-J